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Posted by Petem | Apr 27, 2016 @ 01:56 AM | 1,654 Views
Quite a few years ago, I designed and built a large thermal sailplane, Yingani (the rainbow). It came out at around 4.7 m span with extended tips, weighed 2.8 kg and flew like a dream from the winch. Average flight time per launch was/is over 30 minutes (variometer fitted).
Anyway, time passes, fields shrink and the urge to drag the winch out regularly gradually fades, so I set out to build an electric launch version of the fuselage to fit the original wings.
Finished and flown, YinganE came out a smidgen lighter than the original pure sailplane and seems to fly even better. The pictures tell the story.
Power train is an MVVS hard-case outrunner with 14x8 prop, TGY Plush 60A ESC on a 4S 2200 LiPo. Controls rudder, elevator, spoiler, differential spoiler on Spektrum gear....Continue Reading
Posted by Petem | Jul 25, 2015 @ 01:44 AM | 2,565 Views
I had the urge for quite a while to try a discus launched glider, but did not feel like jumping in at the deep end with a $1000 competition-level airframe. Came across the thread and plan for Mimi and started building.
See Franz Bal's thread at:
http://www.rcgroups.com/forums/showt...highlight=mimi
The original used a solid balsa wing, but 12mm balsa stock of the quality required is hard to find - so off to Compufoil to develop a built-up alternative.
Anyway, Mimi turned out to be a lot of fun and I flew her for several years, until seduced by the even lighter Elf. Sold her to a friend, who had a lot of fun too, until it collided with a nearby planet and came back for a rebuild under warranty.
The pics tell the story.
Cheers,
...Continue Reading
Posted by Petem | May 24, 2015 @ 09:03 PM | 2,262 Views
A while back, I became somewhat obsessed by McCutchen machines (also known as Charybdis, Rotoriser etc). Memories of my youth include these things burping and farting across the field at head height, powered by small diesel or glow engines, never quite on tune.
So I figured a modern one might work, with a brushless motor and lipo (NiCads at first).
The first seven failed to climb, then success with #8 that rose happily towards the ceiling, confounding the doubters!
As you can see, they got stranger and stranger as time went by...
Cheers,
...Continue Reading